Military chocolate has been a part of standard United States military ration since the original Ration D or D ration bar of 1937. Today, military chocolate is issued to troops as part of basic field rations and sundry packs. Chocolate rations served two purposes: as a morale boost, and as a high-energy, pocket-sized emergency ration. Military chocolate rations are often made in special lots to military specifications for weight, size, and endurance. A majority of chocolate issued to military personnel is produced by the Hershey Company.

When provided as a morale boost or care package, military chocolate is often no different from normal store-bought bars in taste and composition. However, they are frequently packaged or molded differently. The World War II K ration issued in temperate climates sometimes included a bar of Hershey’s commercial-formula sweet chocolate. But instead of being the typical flat thin bar, the K ration chocolate was a thick rectangular bar that was square at each end (in tropical regions, the K ration used Hershey’s Tropical Bar formula).